Classical Theorems - Page 5

Complete Quadrilateral: Ortholine-Steiner Line.
Using TracenPoche Dynamic Software
Step-by-Step construction, Manipulation, and animation

Four Circles Theorem Using Interactive Dynamic Software
Step-by-Step construction, Manipulation, and animation.

Three Circles Theorem Using TracenPoche Dynamic Software

Sangaku Geometry Theorem: Three circles and a tangent line.

Sangaku Problem (An Old Japanese Theorem). Inradii, Carnot's theorem.

Van Aubel's Theorem II: Triangle and Cevians.
 

Kurschak's Tile and Theorem. Jozsef Kurschak (Hungary, 1864-1933) An elegant and a purely geometric way of finding the area of a regular dodecagon.
 

The Bevan Point The circumcenter of the excentral triangle. Illustration with animation.

Butterfly Theorem Proof with animation.

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